<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      //   const version = '1.0.0'
      //   version = '2.0.0'

      const user = {
        name: '仙女',
        age: 18,
      }
      //   user = {}
      user.name = '仙男'
      user.age = 19
    </script>
  </body>
</html>
